mirror of https://gitee.com/openkylin/linux.git
PCI/ASPM: Allow ASPM on links to PCIe-to-PCI/PCI-X Bridges
7d715a6c1a
("PCI: add PCI Express ASPM support") added the ability for
Linux to enable ASPM, but for some undocumented reason, it didn't enable
ASPM on links where the downstream component is a PCIe-to-PCI/PCI-X Bridge.
Remove this exclusion so we can enable ASPM on these links.
The Dell OptiPlex 7080 mentioned in the bugzilla has a TI XIO2001
PCIe-to-PCI Bridge. Enabling ASPM on the link leading to it allows the
Intel SoC to enter deeper Package C-states, which is a significant power
savings.
[bhelgaas: commit log]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207571
Link: https://lore.kernel.org/r/20200505173423.26968-1-kai.heng.feng@canonical.com
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
parent
8f3d9f3542
commit
66ff14e59e
|
@ -628,16 +628,6 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist)
|
|||
|
||||
/* Setup initial capable state. Will be updated later */
|
||||
link->aspm_capable = link->aspm_support;
|
||||
/*
|
||||
* If the downstream component has pci bridge function, don't
|
||||
* do ASPM for now.
|
||||
*/
|
||||
list_for_each_entry(child, &linkbus->devices, bus_list) {
|
||||
if (pci_pcie_type(child) == PCI_EXP_TYPE_PCI_BRIDGE) {
|
||||
link->aspm_disable = ASPM_STATE_ALL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* Get and check endpoint acceptable latencies */
|
||||
list_for_each_entry(child, &linkbus->devices, bus_list) {
|
||||
|
|
Loading…
Reference in New Issue